The OP's source appears to be CNN using the Guardian as its source. If you read down at CNN you will see BlackBerry's side:

"As for BlackBerry itself, the company called The Guardian‘s report, and others repeating its claims, “false and misleading”:

“BlackBerry has a long-established relationship with CESG and we remain the only mobile solution approved for use at ‘Restricted’ when configured in accordance with CESG guidelines. This level of approval only comes following a process which is rigorous and absolutely necessary given the highly confidential nature of the communications being transmitted."Posted via BlackBerryForums.com Mobile